@book{Bazaraa:1990:LPN:77656,
 author = {Bazaraa, Mokhtar S. and Jarvis, John J. and Sherali, Hanif D.},
 title = {Linear programming and network flows (2nd ed.)},
 year = {1990},
 isbn = {0-471-63681-9},
 publisher = {John Wiley \& Sons, Inc.},
 address = {New York, NY, USA},
} 

@book{Ahuja:1993:NFT:137406,
 author = {Ahuja, Ravindra K. and Magnanti, Thomas L. and Orlin, James B.},
 title = {Network flows: theory, algorithms, and applications},
 year = {1993},
 isbn = {0-13-617549-X},
 publisher = {Prentice-Hall, Inc.},
 address = {Upper Saddle River, NJ, USA},
} 